CatalogPartCollection.Item[] 属性

参考

定义

命名空间:: System.Web.UI.WebControls.WebParts

程序集:: System.Web.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

根据位置或唯一标识符返回集合中的特定成员。

重载

Item[Int32]	基于集合中的位置获取或设置集合的成员。
Item[String]	基于唯一字符串标识符返回集合的成员。

Item[Int32]

基于集合中的位置获取或设置集合的成员。

public:
 property System::Web::UI::WebControls::WebParts::CatalogPart ^ default[int] { System::Web::UI::WebControls::WebParts::CatalogPart ^ get(int index); };

public System.Web.UI.WebControls.WebParts.CatalogPart this[int index] { get; }

member this.Item(int) : System.Web.UI.WebControls.WebParts.CatalogPart

Default Public ReadOnly Property Item(index As Integer) As CatalogPart

参数

index: Int32

集合中特定 CatalogPart 的索引。

属性值

CatalogPart

位于集合中指定索引处的 CatalogPart。

示例

下面的代码示例演示如何使用其索引访问对象的成员 CatalogPartCollection 。有关运行示例所需的完整代码，请参阅类概述主题的示例 CatalogPartCollection 部分。

方法中的Button1_Click代码将创建一myParts个名为的新CatalogPartCollection对象。请注意，该方法使用 Item[] 索引器从集合的第一个成员检索信息。

protected void Button1_Click(object sender, EventArgs e)
{
  ArrayList list = new ArrayList(2);
  list.Add(PageCatalogPart1);
  list.Add(DeclarativeCatalogPart1);
  // Pass an ICollection object to the constructor.
  CatalogPartCollection myParts = new CatalogPartCollection(list);
  foreach (CatalogPart catalog in myParts)
  {
    catalog.Description = "My " + catalog.DisplayTitle;
  }

  // Use the IndexOf property to locate a CatalogPart control.
  int PageCatalogPartIndex = myParts.IndexOf(PageCatalogPart1);
  myParts[PageCatalogPartIndex].ChromeType = PartChromeType.TitleOnly;

  // Use the Contains method to see if a CatalogPart control exists.
  if (myParts.Contains(PageCatalogPart1))
  {
    WebPart closedWebPart = null;
    WebPartDescriptionCollection descriptions = PageCatalogPart1.GetAvailableWebPartDescriptions();
    if (descriptions.Count > 0)
    {
      closedWebPart = PageCatalogPart1.GetWebPart(descriptions[0]);
      closedWebPart.AllowClose = false;
    }
  }
  
  // Use indexers to display the details of the CatalogPart controls.
  Label1.Text = String.Empty;
  Label1.Text =
    "<h3>PageCatalogPart Details</h3>" +
    "ID: " + myParts[0].ID + "<br />" +
    "Count: " + myParts[0].GetAvailableWebPartDescriptions().Count;
  Label1.Text += 
    "<h3>DeclarativeCatalogPart Details</h3>" +
    "ID: " + myParts["DeclarativeCatalogPart1"].ID + "<br />" +
    "Count: " + myParts["DeclarativeCatalogPart1"].GetAvailableWebPartDescriptions().Count;
}

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) 
    Dim list As New ArrayList(2)
    list.Add(PageCatalogPart1)
    list.Add(DeclarativeCatalogPart1)
    ' Pass an ICollection object to the constructor.
    Dim myParts As New CatalogPartCollection(list)
    Dim catalog As CatalogPart
    For Each catalog In  myParts
        catalog.Description = "My " + catalog.DisplayTitle
    Next catalog
    
    ' Use the IndexOf property to locate a CatalogPart control.
    Dim PageCatalogPartIndex As Integer = _
      myParts.IndexOf(PageCatalogPart1)
    myParts(PageCatalogPartIndex).ChromeType = PartChromeType.TitleOnly
    
    ' Use the Contains method to see if a CatalogPart control exists.
    If myParts.Contains(PageCatalogPart1) Then
        Dim closedWebPart As WebPart = Nothing
        Dim descriptions As WebPartDescriptionCollection = _
          PageCatalogPart1.GetAvailableWebPartDescriptions()
        If descriptions.Count > 0 Then
            closedWebPart = PageCatalogPart1.GetWebPart(descriptions(0))
            closedWebPart.AllowClose = False
        End If
    End If
    
    ' Use indexers to display the details of the CatalogPart controls.
    Label1.Text = String.Empty
    Label1.Text = _
      "<h3>PageCatalogPart Details</h3>" & _
      "ID: " & myParts(0).ID + "<br />" & _
      "Count: " & myParts(0).GetAvailableWebPartDescriptions().Count
    Label1.Text += _
      "<h3>DeclarativeCatalogPart Details</h3>" & _
      "ID: " & myParts("DeclarativeCatalogPart1").ID & "<br />" & _
      "Count: " & myParts("DeclarativeCatalogPart1") _
        .GetAvailableWebPartDescriptions().Count

End Sub

在浏览器中加载页面时，可以通过在 “显示模式”下拉列表控件中选择 “目录”将页面切换到目录模式。单击 “显示 CatalogPart 属性 ”按钮可以访问 CatalogPartCollection 对象并显示包含 CatalogPart 控件的某些属性。通过使用Item[]方法中的索引器获取控件中的PageCatalogPartButton1_Click可用服务器控件计数。

注解

索引Item[]器允许你通过索引访问对象中的CatalogPartCollection基础CatalogPart控件，并更改其属性值或调用方法。

另请参阅

ASP.NET Web 部件控件

适用于

Item[String]

基于唯一字符串标识符返回集合的成员。

public:
 property System::Web::UI::WebControls::WebParts::CatalogPart ^ default[System::String ^] { System::Web::UI::WebControls::WebParts::CatalogPart ^ get(System::String ^ id); };

public System.Web.UI.WebControls.WebParts.CatalogPart this[string id] { get; }

member this.Item(string) : System.Web.UI.WebControls.WebParts.CatalogPart

Default Public ReadOnly Property Item(id As String) As CatalogPart

参数

id: String

集合中特定 CatalogPart 的唯一标识符。

属性值

CatalogPart

集合中 ID 等于 id 的值的第一个 CatalogPart。

示例

下面的代码示例演示如何使用对象的字符串 ID 值访问对象的成员 CatalogPartCollection 。有关运行示例所需的完整代码，请参阅类概述主题的示例 CatalogPartCollection 部分。

方法中的Button1_Click代码将创建一myParts个名为的新CatalogPartCollection对象。该方法使用 Item[] 索引器检索有关 DeclarativeCatalogPart 控件的信息，该控件是集合的第二个成员。

protected void Button1_Click(object sender, EventArgs e)
{
  ArrayList list = new ArrayList(2);
  list.Add(PageCatalogPart1);
  list.Add(DeclarativeCatalogPart1);
  // Pass an ICollection object to the constructor.
  CatalogPartCollection myParts = new CatalogPartCollection(list);
  foreach (CatalogPart catalog in myParts)
  {
    catalog.Description = "My " + catalog.DisplayTitle;
  }

  // Use the IndexOf property to locate a CatalogPart control.
  int PageCatalogPartIndex = myParts.IndexOf(PageCatalogPart1);
  myParts[PageCatalogPartIndex].ChromeType = PartChromeType.TitleOnly;

  // Use the Contains method to see if a CatalogPart control exists.
  if (myParts.Contains(PageCatalogPart1))
  {
    WebPart closedWebPart = null;
    WebPartDescriptionCollection descriptions = PageCatalogPart1.GetAvailableWebPartDescriptions();
    if (descriptions.Count > 0)
    {
      closedWebPart = PageCatalogPart1.GetWebPart(descriptions[0]);
      closedWebPart.AllowClose = false;
    }
  }
  
  // Use indexers to display the details of the CatalogPart controls.
  Label1.Text = String.Empty;
  Label1.Text =
    "<h3>PageCatalogPart Details</h3>" +
    "ID: " + myParts[0].ID + "<br />" +
    "Count: " + myParts[0].GetAvailableWebPartDescriptions().Count;
  Label1.Text += 
    "<h3>DeclarativeCatalogPart Details</h3>" +
    "ID: " + myParts["DeclarativeCatalogPart1"].ID + "<br />" +
    "Count: " + myParts["DeclarativeCatalogPart1"].GetAvailableWebPartDescriptions().Count;
}

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) 
    Dim list As New ArrayList(2)
    list.Add(PageCatalogPart1)
    list.Add(DeclarativeCatalogPart1)
    ' Pass an ICollection object to the constructor.
    Dim myParts As New CatalogPartCollection(list)
    Dim catalog As CatalogPart
    For Each catalog In  myParts
        catalog.Description = "My " + catalog.DisplayTitle
    Next catalog
    
    ' Use the IndexOf property to locate a CatalogPart control.
    Dim PageCatalogPartIndex As Integer = _
      myParts.IndexOf(PageCatalogPart1)
    myParts(PageCatalogPartIndex).ChromeType = PartChromeType.TitleOnly
    
    ' Use the Contains method to see if a CatalogPart control exists.
    If myParts.Contains(PageCatalogPart1) Then
        Dim closedWebPart As WebPart = Nothing
        Dim descriptions As WebPartDescriptionCollection = _
          PageCatalogPart1.GetAvailableWebPartDescriptions()
        If descriptions.Count > 0 Then
            closedWebPart = PageCatalogPart1.GetWebPart(descriptions(0))
            closedWebPart.AllowClose = False
        End If
    End If
    
    ' Use indexers to display the details of the CatalogPart controls.
    Label1.Text = String.Empty
    Label1.Text = _
      "<h3>PageCatalogPart Details</h3>" & _
      "ID: " & myParts(0).ID + "<br />" & _
      "Count: " & myParts(0).GetAvailableWebPartDescriptions().Count
    Label1.Text += _
      "<h3>DeclarativeCatalogPart Details</h3>" & _
      "ID: " & myParts("DeclarativeCatalogPart1").ID & "<br />" & _
      "Count: " & myParts("DeclarativeCatalogPart1") _
        .GetAvailableWebPartDescriptions().Count

End Sub

在浏览器中加载页面时，可以通过在 “显示模式”下拉列表控件中选择 “目录”将页面切换到目录模式。单击 “显示 CatalogPart 属性 ”按钮可以访问 CatalogPartCollection 对象并显示包含 CatalogPart 控件的某些属性。通过使用Item[]方法中的索引器获取控件中的DeclarativeCatalogPartButton1_Click可用服务器控件计数。

注解

索引Item[]器允许你通过使用字符串标识符访问对象中的CatalogPartCollection基础CatalogPart控件。尽管对象是只读的 CatalogPartCollection ，但你可以更改索引器访问的基础控件上的属性值或调用方法。

另请参阅

ASP.NET Web 部件控件

适用于

CatalogPartCollection.Item[] 属性

定义

重载

Item[Int32]

参数

属性值

示例

注解

另请参阅

适用于

Item[String]

参数

属性值

示例

注解

另请参阅

适用于

其他资源